Applicable Systems
EMCP 4.2
Symptoms
Check engine light active; engine may derate or run rough; diagnostic code logged in ECM.
Possible Causes
- Injector actuation pressure sensor short to +V supply
- Sensor internal failure
- Wiring harness damage near sensor connector
Troubleshooting Steps
- Step 1: Connect Cat ET diagnostic tool and read active codes
CID 164-03 appears as active or logged fault - Step 2: Inspect sensor connector for corrosion or bent pins
Connector clean and pins straight - Step 3: Measure sensor supply voltage at connector pin 1
5.0V DC +/- 0.2V - Step 4: Check sensor signal wire for short to +V
Signal wire resistance to +V > 10k ohm - Step 5: Replace injector actuation pressure sensor if defective
Code clears after ET reset and key cycle
How to Reset
Clear codes using Cat ET after repair; cycle key switch OFF/ON with 30s wait.
Common Replacement Parts
- Injector Actuation Pressure Sensor P/N: 154-4710
- Cat C15 Sensor Harness
Frequently Asked Questions
- Q: Can I drive with this code active?
Limited operation only; engine will derate to protect injectors. Schedule repair promptly.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: caterpillarfaultcodes.com + Cat ET CID list
Category: Heavy Equipment
Published: 2026-10-31
No comments yet. Be the first to share your experience!